Fundamental research on gas–solid reaction between CO2 and Li2CuO2 linking application for solid CO2 absorbent

Ohishi, Kazuo; Matsukura, Yusuke; Okumura, Takahiro; Matsunaga, Yuuki; Kobayashi, Ryota

doi:10.1016/j.jssc.2013.12.018

Cited by 60 publications

(46 citation statements)

References 32 publications

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“…In fact, this weight can be divided into two clear temperature ranges from 180 to 415°C and 415 to 740°C, corresponding to the superficial and bulk CO 2 chemisorption processes, respectively. This result is in agreement with other sodium and lithium ceramics where their respective dynamic thermograms exhibit one or two consecutive weight increments associated with the superficial and bulk CO 2 chemisorption processes followed by a final weight decrease associated with CO 2 desorption [7,11,15,[17][18][19][20][21][22][23][24]. In this sample, the first maximum weight increase, which was equal to 0.8 wt%, was observed at $400°C.…”

Section: Resultssupporting

confidence: 91%

“…Nevertheless, the dynamic thermogram reached a final efficiency equal to 38.4%, which is comparable to that of other sodium and lithium ceramics with higher alkaline/metal molar ratios [10,14,[16][17][18]20,21,47]. Therefore, different isothermal experiments were performed, and the products obtained from those isotherms were re-characterized by XRD and SEM to confirm CO 2 chemisorption and elucidate the possible reaction mechanism.…”

Section: Resultssupporting

confidence: 57%

“…These processes may be of great interest for the design of separation systems from different flow gas effluents. Therefore, it is very important to understand the CO 2 capture properties of this ceramic even though the Na/Co molar ratio is not as high as that in other alkaline ceramics [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]47]. Based on this perspective, CO 2 chemisorption on sodium cobaltate was studied.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

CO2 chemisorption and evidence of the CO oxidation–chemisorption mechanisms on sodium cobaltate

Vera

Alcántar-Vázquez

Pfeiffer

2015

Chemical Engineering Journal

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

CO2 chemisorption and evidence of the CO oxidation–chemisorption mechanisms on sodium cobaltate

Vera

Alcántar-Vázquez

Pfeiffer

2015

Chemical Engineering Journal

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“…Li 2 CuO 2 is an attractive material with many interesting characteristics, already considered for CO 2 chemisorption 15,16 . In battery applications, a phase transition during the first circle of charge/discharge is confirmed and attributed to oxygen loss and delithiation.…”

Section: Introductionmentioning

confidence: 99%

Defects and lithium migration in Li2CuO2

Kordatos

Kuganathan

Kelaidis

et al. 2018

Sci Rep

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Li2CuO2 is an important candidate material as a cathode in lithium ion batteries. Atomistic simulation methods are used to investigate the defect processes, electronic structure and lithium migration mechanisms in Li2CuO2. Here we show that the lithium energy of migration via the vacancy mechanism is very low, at 0.11 eV. The high lithium Frenkel energy (1.88 eV/defect) prompted the consideration of defect engineering strategies in order to increase the concentration of lithium vacancies that act as vehicles for the vacancy mediated lithium self-diffusion in Li2CuO2. It is shown that aluminium doping will significantly reduce the energy required to form a lithium vacancy from 1.88 eV to 0.97 eV for every aluminium introduced, however, it will also increase the migration energy barrier of lithium in the vicinity of the aluminium dopant to 0.22 eV. Still, the introduction of aluminium is favourable compared to the lithium Frenkel process. Other trivalent dopants considered herein require significantly higher solution energies, whereas their impact on the migration energy barrier was more pronounced. When considering the electronic structure of defective Li2CuO2, the presence of aluminium dopants results in the introduction of electronic states into the energy band gap. Therefore, doping with aluminium is an effective doping strategy to increase the concentration of lithium vacancies, with a minimal impact on the kinetics.

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“…9),14) 16) In these oxides, Li 4 SiO 4 is the most expected to be excellent solid CO 2 absorbent because of its high CO 2 absorption rate and its superiority in repeated use. The gassolid reaction between CO 2 and Li 4 SiO 4 , shown below as reversible reaction (1), is already well-known.…”

mentioning

confidence: 99%

Analysis of CO2 absorption reaction of Li4SiO4 on the basis of madelung potential of Li site in crystal structure

Ohishi

Kobayashi

Oka

2017

J. Ceram. Soc. Japan

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We estimated site potentials for respective Li ions in the unit cell of Li 4 SiO 4 crystal structure using the VESTA program and examined relation between the estimated site potentials and reactivity of the respective Li ions to CO 2 . Values of the estimated site potentials for the respective Li ions were distributed over a range of the shallowest level (¹11.6 V) to the deepest level (¹17.3 V). It is forecasted that the depth of these potentials would relate with reaction between CO 2 and the respective Li ions in the unit cell of the Li 4 SiO 4 crystal structure.

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Fundamental research on gas–solid reaction between CO2 and Li2CuO2 linking application for solid CO2 absorbent

Cited by 60 publications

References 32 publications

CO2 chemisorption and evidence of the CO oxidation–chemisorption mechanisms on sodium cobaltate

CO2 chemisorption and evidence of the CO oxidation–chemisorption mechanisms on sodium cobaltate

Defects and lithium migration in Li2CuO2

Analysis of CO<sub>2</sub> absorption reaction of Li<sub>4</sub>SiO<sub>4</sub> on the basis of madelung potential of Li site in crystal structure

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